How to apply LINQ's Distinct() over a particular property
The LINQ distinct() function is used in C# to remove all the duplicate elements from a list and return the unique elements present in that particular list.
Syntax
obj.Select(s => s.gpa).Distinct();
Here, obj is the object of a class, and gpa is the particular property we are selecting from the class.
Parameters
It will take the list of a particular property from where you want to remove repetitive elements.
Return type
The distinct() function returns a list of elements from the source after removing duplicates. If no copies are present, it will return the same list. It can store either in var or list.
Note: We are using
var; this variable type depends on the initial value it stores.
Example
The code below will explain how to use distinct().
using System;using System.Linq;using System.Collections.Generic;public class Animals{public string Name { get; set; }public int ID { get; set; }static public void Main(){var zoo = new List<Animals>();zoo.Add(new Animals() { Name = "Monkey", ID = 1 });zoo.Add(new Animals() { Name = "Lion", ID = 2 });zoo.Add(new Animals() { Name = "Monkey", ID = 3 });zoo.Add(new Animals() { Name = "Tiger", ID = 2 });zoo.Add(new Animals() { Name = "Lion", ID = 4 });var result =zoo.Select(s => s.Name).Distinct();foreach (var animal in result){Console.WriteLine(animal);}}}
Explanation
- Lines 1–3: We use necessary directives.
- Line 5: We create a class name
Animals. - Lines 7–8: We create two parameters for our class.
- Line 12: We create an object of a class name
zoo. - Lines 13–17: We add data to our class
zoolist. - Lines 19: We select a property
Namefrom thezooclass and store it in the result. - Lines 21–23: We print the removed elements from the chosen property.
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